Late Miocene ice sheet elevation in the Grove Mountains, East Antarctica, inferred from cosmogenic 21 Ne- 10 Be- 26 Al
Late Miocene ice sheet elevation in the Grove Mountains, East Antarctica, inferred from cosmogenic 21 Ne- 10 Be- 26 Al
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DOI：
10.1016/j.gloplacha.2010.03.005
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发表时间：
2010-05
影响因子：
3.9
通讯作者：
P. Kong;Feixin Huang;Xiaohan Liu;D. Fink;L. Ding;Qingzhou Lai
中科院分区：
文献类型：
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作者：
P. Kong;Feixin Huang;Xiaohan Liu;D. Fink;L. Ding;Qingzhou Lai
格罗夫山脉位于东南极腹地，由修女组成。努纳塔克山脉的地貌特征表明，过去的冰盖海拔已经超过了格罗夫山脉的顶峰。宇宙成因的21Ne、10Be和26Al测年得出了五个基岩样品的表面暴露年龄，这些样品取自哈丁山的山顶，这是格罗夫山脉典型的双峰山。用多核素拟合法计算了冰盖退到哈丁山山顶以下的时间，所有数据都指向晚中新世，∼6.3 Ma前。这一结果为晚中新世格罗夫山脉东南极冰盖的海拔高度提供了第一个陆基证据，该冰盖高度达到2300米，比现在的冰盖水平高出200米。晚中新世冰盖高度高于现今，同时南大洋温度较高，表明水汽输送在东南极内部冰盖扩张中起着重要作用。
The Grove Mountains, lying in the interior of East Antarctica, consist of 64 nunataks. Geomorphic characteristics of the nunataks suggest that past ice sheet elevations have overtopped the summits of the Grove Mountains. Cosmogenic21Ne,10Be and26Al dating yields surface exposure ages of five bedrock samples taken from the crest of Mount Harding, a typical nunatak in the Grove Mountains. Using multi-nuclide fitting, we have calculated the time that the ice sheet retreated below the crest of Mount Harding; all data point to the late Miocene, ∼6.3Ma ago. The results provide the first land-based evidence of the elevation of the East Antarctic Ice Sheet in the Grove Mountains in Late Miocene, which reached 2300m, 200m higher than the current ice sheet level. The higher than current ice sheet elevations during the late Miocene together with contemporaneously higher temperatures in the Southern Ocean suggest that moisture transport plays an important role in ice sheet expansion in the interior of East Antarctica.